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  <section id="jerasure">
<h1>jerasure 插件<a class="headerlink" href="#jerasure" title="Permalink to this heading"></a></h1>
<section id="id1">
<h2>简介<a class="headerlink" href="#id1" title="Permalink to this heading"></a></h2>
<p>jerasure 插件可接受的参数有：</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">ceph</span> <span class="n">osd</span> <span class="n">erasure</span><span class="o">-</span><span class="n">code</span><span class="o">-</span><span class="n">profile</span> <span class="nb">set</span> <span class="n">myprofile</span> \
        <span class="n">directory</span><span class="o">=&lt;</span><span class="nb">dir</span><span class="o">&gt;</span>         \ <span class="c1"># plugin directory absolute path</span>
        <span class="n">plugin</span><span class="o">=</span><span class="n">jerasure</span>         \ <span class="c1"># plugin name (only jerasure)</span>
        <span class="n">k</span><span class="o">=&lt;</span><span class="n">k</span><span class="o">&gt;</span>                   \ <span class="c1"># data chunks (default 2)</span>
        <span class="n">m</span><span class="o">=&lt;</span><span class="n">m</span><span class="o">&gt;</span>                   \ <span class="c1"># coding chunks (default 2)</span>
        <span class="n">technique</span><span class="o">=&lt;</span><span class="n">technique</span><span class="o">&gt;</span>   \ <span class="c1"># coding technique</span>
</pre></div>
</div>
<p>可用的编码技术有： <em>reed_sol_van</em> 、 <em>reed_sol_r6_op</em> 、 <em>cauchy_orig</em> 、 <em>cauchy_good</em> 、 <em>liberation</em> 、 <em>blaum_roth</em> 和 <em>liber8tion</em> 。</p>
<p>此插件的源码位于 <em>src/erasure-code/jerasure</em> 目录下。它只是这里代码的封装： <a class="reference external" href="https://github.com/ceph/jerasure">https://github.com/ceph/jerasure</a>
和 <a class="reference external" href="https://github.com/ceph/gf-complete">https://github.com/ceph/gf-complete</a> ，它们通过 <em>.gitmodules</em> 配置被嵌进了最新稳定版。该配置里的软件库是上游软件库（ <a class="reference external" href="http://jerasure.org/jerasure/jerasure">http://jerasure.org/jerasure/jerasure </a> 和 <a class="reference external" href="http://jerasure.org/jerasure/gf-complete">http://jerasure.org/jerasure/gf-complete </a> ）的副本。二者的差异，如果有的话，应该只是拉取请求的不同。</p>
</section>
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